combine.c (try_combine): Do not worry about MEMs wrapped by USEs.

combine.c (try_combine): Do not worry about MEMs wrapped by USEs.

2006-01-19  Paolo Bonzini  <bonzini@gnu.org>

	* combine.c (try_combine): Do not worry about MEMs wrapped by USEs.
	(expand_compound_operation, expand_field_assignment): Fail if the
	bit lengths of an extract operation are out of range.
	(make_extraction): Compute wanted_inner_mode based on the position
	and length of the extraction.  Make it extraction_mode for non-constant
	positions, and do not modify offset in that case.  When generating a
	new MEM, use a mode that can hold the extraction while keeping correct
	alignment.  Remove code that supported MEMs wrapped by USEs.
	(simplify_shift_const_1, force_to_mode) <case USE>: Remove.

From-SVN: r109961